28079989 has 12 divisors (see below), whose sum is σ = 33426624. Its totient is φ = 23507064.

The previous prime is 28079977. The next prime is 28079993. The reversal of 28079989 is 98997082.

It is not a de Polignac number, because 28079989 - 2²¹ = 25982837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28079959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4557 + ... + 8770.

It is an arithmetic number, because the mean of its divisors is an integer number (2785552).

Almost surely, 2^28079989 is an apocalyptic number.

It is an amenable number.

28079989 is a deficient number, since it is larger than the sum of its proper divisors (5346635).

28079989 is a wasteful number, since it uses less digits than its factorization.

28079989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13384 (or 13377 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 28079989 is about 5299.0554818760. The cubic root of 28079989 is about 303.9477814568.

The spelling of 28079989 in words is "twenty-eight million, seventy-nine thousand, nine hundred eighty-nine".